We have a control panel that has a 3 phase main breaker E104DISC (note the attached drawing).
As you can see the drawing calls for a single phase 480 vac feed. There is a jumper between the line side C phase down to the load side B phase thus making all phase utilized. The installing contractor pulled a 3 phase 480 feeder in lieu of single phase 480 vac and did not know what to do when he noticed the jumper. Plant engineering reviewed it and suggested to remove the jumper and land a three phases.
Now a plant inspector is reviewing the installation and is raising a concern that using a 3 phase breaker to feed a single phase load may be a code issue.
Please advise with your expert comments if this is an issue.
Thanks
As you can see the drawing calls for a single phase 480 vac feed. There is a jumper between the line side C phase down to the load side B phase thus making all phase utilized. The installing contractor pulled a 3 phase 480 feeder in lieu of single phase 480 vac and did not know what to do when he noticed the jumper. Plant engineering reviewed it and suggested to remove the jumper and land a three phases.
Now a plant inspector is reviewing the installation and is raising a concern that using a 3 phase breaker to feed a single phase load may be a code issue.
Please advise with your expert comments if this is an issue.
Thanks